Honing device



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HONING DEVICE Filed May 22, 1946 ZZ/////////////////////////////A A :mii'i'aif i =n INVENTOR. n' LIONEL G. PENTECOST llr E El "AT TORNEY Patented July 20, 1948 tJNITED STATES PATENT OFFICE HONING DEVICE Lionel G. Pentecost, Portland, Orcg.

Application May 22, 1946, Serial No. 671,473

1 Claim. 1

This invention relates to tools for the honing of cylinders, particularly brake cylinders on motor vehicles.

The primary object of the invention is to provide a honing tool or device that can be inserted within cylinders varying in diameters, the tool adjusting itself to these various diameters.

A still further object of my invention is the provision of means for causing the honing surface of the tool to engage the bore of the cylinder accurately throughout its entire area.

These and other incidental objects will be apparent in the drawings, specification and claim.

Referring to the drawings:

Figure 1 is a side view of my new and improved honing device, parts broken away for convenience of illustration.

Figure 2 is a fragmentary portion of the brake assembly of a vehicle, a section being taken through the brake cylinder including my new and improved honing device.

Figure 3 is a sectional view taken on line 3-3 of Figure 1 looking in the direction indicated.

Figure 4 is a detail of one of the honing heads for holding the abrasive material used in the honing of the cylinder.

Figure 5 illustrates a side view of Figure 4, partially broken away for convenience of illustration.

Figure 6 is an end view of Figure 5.

In the drawings:

My new and improved honing device consists of a shaft I rotatably mounted within a holder 2 and maintained therein by the set screw 3 working within the annular groove 4 of the shaft I. This arrangement permits the shaft to turn in the holder 2, but at the same time is maintained in a relative position to the holder by the set screw 3.

The holder 2 has a handle 5 forming part thereof and may be of any suitable construction, as for instance a die casting. Secured to one end of the shaft I is a crank 6 having suitable handle I. The crank is maintained to the shaft by a set screw 8. I do not wish to be limited to the use of a crank, as the end 9 of the shaft may be inserted within a power drill unit imparting rotation to the shaft.

Threaded at It! to the end I I of the shaft I is a nut I2 having a flange I3 formed thereon and having an extension I4 extending beyond the flange. 'Fixedly secured within the extension I4 is a cross pin I5. This pin passes through the hole I6 of the extension I4 and is held in fixed position bythe set screw I1.

Floating on the pin I5 are two honing heads I3. The honing heads are connected together by the bolts I9. The bolts are threaded to one of the honing heads at 20 and have their heads 2I working in the enlarged holes 22 of the oppositely disposed head, the bolt working freely within the hole 23 of the said head.

A spring 24 forces the honing heads I8 apart, best illustrated in Figures 1 and 2. Secured to the edges 25 of the honing heads are semicircular shoes 26. These shoes are made from spring material and are relatively thin so that they will conform to the inner surface 21 of the cylinder 29 adapting their shape to the size and diameter of the cylinder being honed. These shoes have an abrasive sheet material 29 riding on their faces and. held in place by the cross bars 30, which in turn are held by the screws 3|, which are tapped into the honing heads I8.

I will now describe the operation of my new and improved cylinder honing device. The abrasive sheet material 29 is placed under the bar 30 and the screws 3I tightened securing the abrasive sheet to the face of the shoes 26. The honing heads I8, including the shoes and the abrasive material, are then compressed against the springs 24 by the hand of the operator and inserted in the cylinder 28, the spring 24 causing a pressure between the honing heads I 8, expanding them against the spring shoes 26 which conform to the size and shape of the cylinder, forcing the abrasive sheet thereagainst. The handle 5 is then gripped by the crank 6 which revolves the honing heads I8 by the cross pin I5 through the shaft I in the direction of the arrows, honing the cylinder to an accurate and fine finish.

I do not wish to be limited to the exact mechanical structure as illustrated and described, as this structure may be modified, still coming within the scope of my claim.

What I claim is:

A honing device including a pin, an element for a power connection supporting said pin. spaced apart honing heads on said pin, each head having converging edges in opposed relationship to the next head, spring means for connecting the respective heads to maintain the heads under relative spacing tension when in use, a pair of resilient honing shoes, each shoe having one end secured to one side of a head and curved upwardly and circumferentially and spaced from the head and extended beyond the opposite side of the head when in contact with a surface being honed, the curved and circumferential portion of each LIONEL G. PENTECOST.

REFERENCES CITED The following references are of record in the file of this patent:

Number UNITED STATES PATENTS Name Date Wolfe Oct. 5, 1920 Grimes May 15, 1928 Levoy et a1 Aug. 28, 193 Krastin Apr. 13, 194 

